Pi Coding Agent

Pi Coding Agent is an open-source terminal-first coding agent designed for developers who want a lightweight but highly extensible AI coding workflow. Its official site describes it as a minimal coding harness that can be adapted through TypeScript extensions, skills, prompt templates, themes, and shareable packages installed from npm or git. The agent supports interactive terminal use, print and JSON modes, RPC, and SDK-based embedding, while also offering tree-structured session history, model switching, customizable context engineering, and integration with many model providers. Rather than enforcing one rigid workflow, Pi is built as a flexible foundation for coding agents that developers can shape to match their own engineering process.